remote run: fix error checks

As error types are not preserved on the client side (due to marshaling),
we cannot use `errors.Cause(...)` and friends but, unfortunately, have
to fall back to looking for substring the error messages.

Change the error checks in remote run to do substring matches and fix
issue #7340.

Fixes: #7340
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

2 files changed, 12 insertions, 3 deletions

diff --git a/pkg/domain/infra/tunnel/containers.go b/pkg/domain/infra/tunnel/containers.go
index 062b38a70..35550b9be 100644
--- a/pkg/domain/infra/tunnel/containers.go
+++ b/pkg/domain/infra/tunnel/containers.go
@@ -19,6 +19,7 @@ import (
 	"github.com/containers/podman/v2/pkg/bindings"
 	"github.com/containers/podman/v2/pkg/bindings/containers"
 	"github.com/containers/podman/v2/pkg/domain/entities"
+	"github.com/containers/podman/v2/pkg/errorhandling"
 	"github.com/containers/podman/v2/pkg/specgen"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -537,8 +538,8 @@ func (ic *ContainerEngine) ContainerRun(ctx context.Context, opts entities.Conta
 		// de-spaghetti the code.
 		defer func() {
 			if err := containers.Remove(ic.ClientCxt, con.ID, bindings.PFalse, bindings.PTrue); err != nil {
-				if errors.Cause(err) == define.ErrNoSuchCtr ||
-					errors.Cause(err) == define.ErrCtrRemoved {
+				if errorhandling.Contains(err, define.ErrNoSuchCtr) ||
+					errorhandling.Contains(err, define.ErrCtrRemoved) {
 					logrus.Warnf("Container %s does not exist: %v", con.ID, err)
 				} else {
 					logrus.Errorf("Error removing container %s: %v", con.ID, err)
@@ -556,7 +557,7 @@ func (ic *ContainerEngine) ContainerRun(ctx context.Context, opts entities.Conta
 
 	// Determine why the wait failed.  If the container doesn't exist,
 	// consult the events.
-	if !strings.Contains(waitErr.Error(), define.ErrNoSuchCtr.Error()) {
+	if !errorhandling.Contains(waitErr, define.ErrNoSuchCtr) {
 		return &report, waitErr
 	}
 
diff --git a/pkg/errorhandling/errorhandling.go b/pkg/errorhandling/errorhandling.go
index 3117b0ca4..ca6b60bc5 100644
--- a/pkg/errorhandling/errorhandling.go
+++ b/pkg/errorhandling/errorhandling.go
@@ -57,3 +57,11 @@ func CloseQuiet(f *os.File) {
 		logrus.Errorf("unable to close file %s: %q", f.Name(), err)
 	}
 }
+
+// Contains checks if err's message contains sub's message. Contains should be
+// used iff either err or sub has lost type information (e.g., due to
+// marshaling).  For typed errors, please use `errors.Contains(...)` or `Is()`
+// in recent version of Go.
+func Contains(err error, sub error) bool {
+	return strings.Contains(err.Error(), sub.Error())
+}